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Finding the Fourth Proportional to 13,187.60, 19,755.48 and 7,980.56

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Solution

The fourth proportional to 13,187.60, 19,755.48 and 7,980.56 is: 11,955.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,187.60 : 19,755.48 = 7,980.56 : x
  2. Step 2: Convert to fraction form
    13,187.60/19,755.48 = 7,980.56/x
  3. Step 3: Cross multiply
    13,187.60x = 19,755.48 × 7,980.56
  4. Step 4: Simplify right side
    13,187.60x = 157,659,793.47
  5. Step 5: Solve for x
    x = 157,659,793.47/13,187.60
  6. Step 6: Final answer
    x = 11,955.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.